How to add hash keys to Wordpress tags

I'm building a website about music chords. Sharp chords look like this example: F#m7b5. That chord (F#m7b5) can be called in many other way like:

F# half-diminished, F# minor seventh flat fifth, F# minor seventh flat five, F#m7b5, F#∅, F#m7(b5), F#º7, F#1/2dim, F#1/2dim7, F#m7(-5), Fa# ∅, Fa# m7b5, Fa# m7(b5)

I would like that my users will find my F#m7b5 post searching for any of the alternative nomenclature so I've added those as tags but Wordpress doesn't accept the hash keys into tags and after a post update all hash keys disappear.

There's a proper way to add hash keys into tags?